Structural iron form



(No Model.)

T. s. WHITE.

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, NITED STATES PATENT OFFICE.

TIMOTHY SIDNEY WHITE, OF BEAVER FALLS, PENNSYLVANIA.

STRUCTURAL IRON FORM.

SPECIFICATION forming part of Letters Patent No. 496,463, dated May 2, 1893.

- Application filedMay 20.1892. Serial No. 433,651. (No model.)

To all whom it may concern.-

Be it known that I, TIMOTHY SIDNEY WHITE, a citizen of the United States, residing at Beaver Falls, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Structural Iron Forms; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to a peculiar rolled metal section or unit and to the structural members formed by uniting this unit with like or with dissimilar units.

The object is to obtain greater strength for the same amount of material, and at the same time to lessen the cost of manufacture of the members into which the unit enters as a component part. These ends are attained by the use of a novel form of unit giving a more favorable distribution of the metal employed and lessening the number of pieces required, and a form thatis especially adapted to be joined to like or to dissimilar parts.

In the accompanying drawings forming a part of this specification,-Figure l is a cross section of the unit or basic section. Fig. 2 is like section showing two such units joined. Fig. 3 is a cross section of a column formed by adding two 2 bars to the unit section.

The unit section of Fig. 1 is a metal sheet, preferably of uniform thickness, consisting of a broad, plane central web A with narrower webs B 13 extending perpendicularly in opposite directions, respectively, from its edges and narrow webs C 0 extending oppositely from the outer edges of the Webs B, respectively, in planes parallel to the web A, the whole being rolled integrally or in one piece.

The column of Fig. 2 is formed by riveting or otherwise rigidly connecting the flanges O of two of these units, the two units being so disposed that the four Webs B B lie in two planes only. This member is not only adapted for use as'a column, but may be used for a variety of purposes,"particularly to replace the common trough like chords of riety of combinations.

bridges, usuallymade up of plates and angles or plates and channels. This member has the advantage over the constructions referred to that the material is at a greater distance from the neutral axis D-D', and hence the member is stronger, the weight being the same. In this form, if the moments of the webs B and 0 about the neutral axis be made equal to the moments of the Webs B 0 about the same axis, we have a balanced section, or the middle of the webA coincides with the theoretical center of inertia of the member. And to this end it is not necessary that the moment of B should equal the moment of B and the moment of 0 should equal the moment of (1, but only that the combined moments of B and 0 should equal the combined moments of B and 0. Indeed this result will follow though 0' be omitted entirely if the section of B be so great that its moment is equal to the combined moments of B and O. I

The unit may be employed in a great va- In Fig. 3it is shown as forming with two 2 bars the column usually made up of four 2 bars and a plate, that is the labor and material required are largely diminished by using three pieces that can be rolled with equal facility, instead of the five pieces ordinarily found necessary.

What I claim is- 1. A one-piece, rolled structural unit consisting of a broad, plane, central web having uniting flanges integrally connected, respectively, to its opposite edges by narrower webs extending in opposite directions and making an angle with both the central web and the connected flange.

2. The combination with a structural unit consisting of a plane central web having uniting flanges integrally connected to its opposite edges by webs extending in opposite directions at an angle with both the central web and the connected flange, of a flanged unit parallel to the axis of said structural unit and riveted thereto, to form with it a composite structural member. 3. The combination with a structural unit consisting of a central web having uniting flanges integrally connected to its opposite In testimony whereof I aflix my signature in edges, respectively, by oppositely extending presence of two Witnesses. Webs making an angle with both the central web and the flanges of a second identical unit 5 having one of its flanges registering with and \Vitnesses:

rigidly secured to the corresponding flanges J. F. MITCHELL, of the first. S. F. JACKSON.

T. SIDNEY WHITE. 

